音频大地电磁法在滇东北大关悦乐铅锌矿压隐伏矿预测的应用研究

发布时间：2022-04-23 15:43

　　在扬子地台西南边缘的川滇黔毗邻区面积约170,000km2的区域,已发现400多个规模不等的矿床和矿化点。这些矿床显示出矿体呈不规则脉状、后生热液充填成矿、矿物组合简单、富Pb+Zn、常伴生Ag, Ge, Ga, In, Cd等突出特征。大多数矿床赋存在晚元古代至二叠纪碳酸盐岩地层中,明显受构造控制,尤其是NE及NW向断裂交汇处的背斜构造区。因此,川滇黔毗邻区以成为一个重要的Pb-Zn成矿域（带）而被接受。但是,区内已勘查发现的大型、超大型铅锌矿床均赋存在新元古界、寒武系、泥盆系、石炭系及下二叠统的碳酸盐岩岩层中,而在奥陶系、志留系地层中仅发现为数极少的矿化点。实际上,在该区域内存在许多早古生代地层露头区及被巨厚的晚古生代地层覆盖的区域。数十年来,这些地区的找矿潜力也一直被关注。滇东北大关悦乐铅锌矿区即位于川滇黔毗邻区成矿域之滇东北富铅锌多金属成矿带的北段,是一个仅有少量铜铅锌矿化露头的勘查空白区。近期的找矿勘查（包括地面调查、构造-岩相-蚀变研究、地球化学勘查、勘查工程揭露等）发现,矿区浅表部赋存于志留系碳酸盐岩中的脉状铅锌铜多金属矿（化）体较为清楚,均产在张扭性断裂破碎带或不同方向... 

【文章页数】：169 页

【学位级别】：博士

【文章目录】：
ABSTRACT
摘要
ACKNOWLEDGEMENTS
Part of the work developed in this thesis has been published papers
NOMENCLATURE, ABBREVIATIONS AND TERMINOLOGY
INTRODUCTION
    Introduction to the Yuele lead-zinc ore field
    Geographical features of the Yuele lead-zinc ore field
    Historical background of the Yuele lead-zinc ore field
Chapter Ⅰ: Geological Background
    1.1. Regional Geology
        1.1.1. Geotectonic position
        1.1.2. Regional stratigraphic
        1.1.3. Regional structures
        1.1.4. Magmatic rocks
    1.2. Geological evolution and metallogenic background
        1.2.1. The formation of the Yangtze para-platform basement
        1.2.2. The tectonic evolution of the northeast Yunnan platform fold belt
    1.3. Regional metallogenic regularity
Chapter Ⅱ: Geological Characteristics of the Yuele Lead-Zinc Deposit
    2.1. Geological survey
        2.1.1. Strata
        2.1.2. Structure
    2.2. Deposit geology
        2.2.1. Geological features of orebody (deposit)
        2.2.2. Ore characteristics
        2.2.3. Alteration characteristics
        2.2.4. Ore controlled factors and metallogenic regularity
Chapter Ⅲ: The Magnetotelluric Method
    3.1. Introduction
    3.2. Governing equations
    3.3. Magnetotelluric transfer functions
        3.3.1. Impedance tensor and magnetotelluric tensor
        3.3.2. Geomagnetic transfer function
    3.4. Earth MT dimensionality models
        3.4.1. 1D
        3.4.2. 2D
        3.4.3. 3D
        3.4.4. The Galvanic Distortion Phenomenon
    3.5. Electromagnetic sources in MT
    3.6. The Audio-Magnetotelluric methods
    3.7. Applications of AMT Method
    3.8. Time series processing
        3.8.1. General overview
        3.8.2. Common processing techniques
    3.9. Modeling and inversion of MT data
Chapter Ⅳ: Data Acquisition and Processing
    4.1. Field works
        4.1.1. Geodetic works
        4.1.2. Instrumentation
        4.1.3. Quality control
        4.1.4. The geophysical surveys
    4.2. AMT data processing
        4.2.1. Processing overview
        4.2.2. Robust processing
        4.2.3. Signal and noise
        4.2.4. Fast Fourier Transform (FFT) Algorithm
        4.2.5. The Cagniard impedance function
        4.2.6. Fitting the Phase Tensor Data to a 2D Model
Chapter Ⅴ: Data Interpretation
    5.1. Qualitative analysis
    5.2. Static shift
    5.3. Electrical properties of rock
    5.4. The basis of interpretation
        5.4.1. First anomaly level
        5.4.2. Second anomaly level
        5.4.3. Third anomaly level
    5.5. The sounding line electrical resistivity 2D inversion and interpretation
        5.5.1. Survey line 1400
        5.5.2. Survey line 1550
        5.5.3. Survey line 1800
        5.5.4. Survey line 2000
        5.5.5. Survey line 2200
        5.5.6. Survey line C25
        5.5.7. The GMS-07e survey lines 1400+2200 and comprehensive interpretation
Chapter Ⅵ: The Results of Audio-Magnetotelluric data
    6.1. Comparison with geological data
    6.2. Comparison with logging of core
    6.3. Resume
CONCLUSIONS
REFERENCES
ANNEX
    APPENDIX Ⅰ: SINGLE VALUE DECOMPOSITION (SVD) OF DISTORTION MATRIX C
    APPENDIX Ⅱ: FOURIER ANALYSIS
    APPENDIX Ⅲ: THE SOUNDING LINE INVERSION



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